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          <h1 class="post-title" itemprop="name headline">React with TypeScript 系列(四) –数据篇</h1>
        

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        <blockquote>
<p><a href="https://lhweb.gitee.io/blog/2018/09/22/React-with-TypeScript-%E7%B3%BB%E5%88%97-%E4%B8%80-%E6%A6%82%E8%BF%B0/">React with TypeScript 系列(一) –概述</a><br><a href="https://lhweb.gitee.io/blog/2018/09/23/React-with-TypeScript-%E7%B3%BB%E5%88%97-%E4%BA%8C-%E2%80%93%E5%9F%BA%E7%A1%80%E7%AF%87/">React with TypeScript 系列(二) –基础篇</a><br><a href="https://lhweb.gitee.io/blog/2018/09/23/React-with-TypeScript-%E7%B3%BB%E5%88%97-%E4%B8%89-%E5%AE%9E%E6%88%98%E7%AF%87/">React with TypeScript 系列(三) –实战篇</a><br><a href="https://lhweb.gitee.io/blog/2018/09/23/React-with-TypeScript-%E7%B3%BB%E5%88%97-%E5%9B%9B-%E2%80%93%E6%95%B0%E6%8D%AE%E7%AF%87/">React with TypeScript 系列(四) –数据篇</a><br><a href="https://lhweb.gitee.io/blog/2018/09/23/React-with-TypeScript-%E7%B3%BB%E5%88%97-%E4%BA%94-Flux/">React with TypeScript 系列(五) –Flux</a></p>
</blockquote>
<p>前三篇的文章把React的基础和TypeScript对ReactJS的一些整合方式都绍给大家了，接下来几篇会聊到如何和数据业务进行整合。今天先说说简单的数据整合，而之后会说flux。</p>
<p>数据加载现在在JS 上都会使用Promise的模式(<a href="http://www.infoq.com/cn/news/2011/09/js-promise" target="_blank" rel="noopener">http://www.infoq.com/cn/news/2011/09/js-promise</a>) , 而React 对于数据的载入重点不是你用什么方法去利用Promise模式去加载数据。更多是关心你的数据是怎么触发数据页面的DOM元素的变化。在该系列文章的第二篇也有提及几个名JSX, State,Props都是React中数据加载后影响的几个元素。</p>
<p>我们来看看State变化时的一些细节，触发DOM元素的变化是在ComponnetDidUpdate()方法内，这里通过SetState去触发重新的render()<br><img src="/blog/2018/09/23/React-with-TypeScript-系列-四-–数据篇/20160116125411208.png" alt><br>而Props 的变化也大致和State一样<br><img src="/blog/2018/09/23/React-with-TypeScript-系列-四-–数据篇/20160116130549172.png" alt><br>好我们先来看看代码（话说代码大家都是比较关注的），继续我们之前的例子，需要加载数据的是CatalogList这个组件，所以我们把焦点放在这里。</p>
<ol>
<li><p>先做好一个DataService.ts , 这里我用到了jquery 和 bluebird</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">///</span></span><br><span class="line"><span class="comment">///</span></span><br><span class="line"></span><br><span class="line"><span class="built_in">module</span> ReactDemo.Utils</span><br><span class="line">&#123;</span><br><span class="line"><span class="keyword">export</span> <span class="class"><span class="keyword">class</span> <span class="title">DataService</span></span>&#123;</span><br><span class="line"></span><br><span class="line">getCatalogList() : <span class="built_in">Promise</span>&#123;</span><br><span class="line"><span class="keyword">var</span> url = <span class="string">'/api/values'</span>;</span><br><span class="line"><span class="keyword">return</span> <span class="keyword">this</span>.getPromise(url);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">private getPromise(api: string): <span class="built_in">Promise</span> &#123;</span><br><span class="line"><span class="keyword">return</span> <span class="keyword">new</span> <span class="built_in">Promise</span>(<span class="function">(<span class="params">resolve: (result: string</span>) =&gt;</span> <span class="keyword">void</span>, <span class="attr">reject</span>: <span class="function">(<span class="params">error: string</span>) =&gt;</span> <span class="keyword">void</span>): <span class="function"><span class="params">void</span> =&gt;</span> &#123;</span><br><span class="line">$.ajax(&#123;</span><br><span class="line">url: api,</span><br><span class="line">cache: <span class="literal">false</span>,</span><br><span class="line">dataType: <span class="string">"json"</span>,</span><br><span class="line">type: <span class="string">"GET"</span>,</span><br><span class="line">success: resolve.bind(<span class="keyword">this</span>),</span><br><span class="line">error: <span class="function">(<span class="params">jqXHR: JQueryXHR, status: string, message: string</span>) =&gt;</span> &#123;</span><br><span class="line">reject(<span class="string">`status[<span class="subst">$&#123;status&#125;</span>] message[<span class="subst">$&#123;message&#125;</span>]`</span>);</span><br><span class="line">&#125;</span><br><span class="line">&#125;);</span><br><span class="line">&#125;);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>我们需要对之前的CatalogList 和 CatalogItem 做对应调整，由于我们需要在CatalogList上加载数据，所以我们需要定义它的State值，而在CatalogItem中我们只需要把CatalogList中加载数据后的每一项数据传递给CatalogItem的Props即可。</p>
</li>
</ol>
<p>先看我们定义的CatalogItem , 这里我们定义了一个接收数据的Props , 注意一点在ReactJS中初始化getInistailState在TypeScript中的呈现方式是用构造函数所取代的，而参数值传递是以{}作为标签，根据接口的数据，就有了我们下列的呈现方式<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">interface CatalogItemProps &#123;</span><br><span class="line">data : any;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">CatalogItem</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span>&lt;<span class="title">CatalogItemProps</span>,<span class="title">any</span>&gt;</span>&#123;</span><br><span class="line"></span><br><span class="line"><span class="keyword">constructor</span>(props : CatalogItemProps)&#123;</span><br><span class="line"><span class="keyword">super</span>(props);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public render()</span><br><span class="line">&#123;</span><br><span class="line"><span class="keyword">return</span> (</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#123;<span class="keyword">this</span>.props.data.catalogGroupPrice&#125;折</span><br><span class="line">&#123;<span class="keyword">this</span>.props.data.catalogGroup&#125;人团</span><br><span class="line">&#123;<span class="keyword">this</span>.props.data.catalogName&#125;</span><br><span class="line">&#123;<span class="keyword">this</span>.props.data.catalogIntro&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#123;<span class="keyword">this</span>.props.data.catalogGroup&#125;人团</span><br><span class="line">¥&#123;<span class="keyword">this</span>.props.data.catalogGroupPrice&#125;</span><br><span class="line">去开团</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">);</span><br><span class="line">&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>而CatalogList 如下：<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">interface CatalogListState &#123;</span><br><span class="line">list : any ;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">interface CatalogListProps &#123;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">CatalogList</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span>&lt;<span class="title">CatalogListProps</span>,<span class="title">CatalogListState</span>&gt;</span>&#123;</span><br><span class="line"></span><br><span class="line">public state : CatalogListState ;</span><br><span class="line"></span><br><span class="line"><span class="keyword">constructor</span>(props : CatalogListProps)&#123;</span><br><span class="line"><span class="keyword">super</span>(props);</span><br><span class="line"><span class="keyword">this</span>.state = &#123;<span class="attr">list</span> : []&#125;;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public componentDidMount: <span class="function"><span class="params">()</span> =&gt;</span> <span class="keyword">void</span> =</span><br><span class="line">(): <span class="function"><span class="params">void</span> =&gt;</span> &#123;</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> dataService = <span class="keyword">new</span> ReactDemo.Utils.DataService();</span><br><span class="line"><span class="keyword">var</span> dataList;</span><br><span class="line">dataService.getCatalogList().then(<span class="function">(<span class="params">result:string</span>)=&gt;</span>&#123;</span><br><span class="line"><span class="keyword">this</span>.setState(&#123;<span class="attr">list</span>:result&#125;);</span><br><span class="line"></span><br><span class="line">&#125;);</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">public render()</span><br><span class="line">&#123;</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> catalogs;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span>(<span class="keyword">this</span>.state.list)&#123;</span><br><span class="line">catalogs = <span class="keyword">this</span>.state.list.map(<span class="function"><span class="keyword">function</span>(<span class="params">catalog</span>)</span>&#123;</span><br><span class="line"><span class="keyword">return</span> (</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">);</span><br><span class="line">&#125;);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">return</span> (</span><br><span class="line"></span><br><span class="line">&#123;catalogs&#125;</span><br><span class="line">);</span><br><span class="line">&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>关于CatalogList需要注意的地方是你必须判断state中list是否有效否则会出错，所以if(this.state)是不能缺少的，否则出错，其次不要忘记componentDidMount才能触发this.setState(….)</p>
<ol start="3">
<li>运行后你就可以看结果了（图片就不在这里加载了）<br><img src="/blog/2018/09/23/React-with-TypeScript-系列-四-–数据篇/20160116143551811.png" alt></li>
</ol>
<p>好就说到这里，明天我们谈flux</p>

      
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